Friday, September 8, 2006
1. Mean score for each quiz,
Regrade policy: submit written (
WRITTEN, NOT ORAL
purple Re-Grade Folder
at front of classroom.
You will have
one week after
the quizzes are returned to submit a quiz for re-grading.
If you do not pick up your quiz today at the end of lecture, you can find your quiz at
the Reserve Desk of the Bio Center, 2
floor of Stimson.
Quiz 2 on Wed 9/13 will cover lectures 4, 5, 6, 7.
Policy reminder: If you missed
Quiz 1 (or if you miss any quiz for any reason) you are eligible to take the make-up quiz
on Wed 11/29 (which will cover the lectures from 11/13 – 11/20).
Meet today: Comstock B106
1:25 – 2:15PM with
interested students: How do I
apply to graduate schools?
What are they looking for?!
RasMol assignment #2: Secondary Structures.
Get instruction folder from
Open folder, follow instructions.
Watch two videos!
Steric Hindrance of a Polypeptide Chain
" and "
Secondary Structures in Proteins
Characteristics of the
-helix, b-sheet, and turns
Alpha helix, beta sheets and turns account for a majority, about 60%, of all AAs in
Nonetheless, in most proteins, some sections of the polypeptide chain do not
so you don't see recognizable structure.
Such "coil" or
“loop” regions of proteins are certainly NOT random because they are exactly the same
in every copy of that protein, but they are simply not in alpha, beta, or turn structure.
These “coil” or “loop” regions must (somehow!) make all possible H-bonds, just like
alpha helices and beta sheets and turns.
Where we are going, where we are in this course in our study of biochemistry: